The natural flow of water? A fish tank is too small to exhibit Coriolan
tendencies. If you are refering to something else, please explain...

http://www.physics.ohio-state.edu/~d...du/newcor.html :-)

I think what he is saying is that even though those forces exist, they do not exist in a
large enough scale to really effect a fish tank.

and they may or may not, I have not spent the time trying to figure it out, I do have a
125 gal grow out pond that spins "backwards" and it does so with ease so my vote as if it
mattered, is for the volume of water we have, this will not effect pump performance. if
you read the section 5.2 in your link it might explain this a little.

--
Richard Reynolds